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Just a tip or two, you might need a few more hiding spaces for your serpae's. Barbs can sometimes gets territorial and nippy. I have both in my tank and I've watched my serpae's dart for cover when the barbs get grumpy. LOL!!

Also your red tail shark will eventually outgrow your tank. They can get big. They can also be aggressive, depends on the shark though I think. I've had both kinds. Some play nice, others don't. ;)